Sergei Katsev


Associate Professor • Large Lakes Observatory & Department of Physics • University of Minnesota Duluth


      

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Lake Malawi (Malawi and Mozambique)

Publications:
  • Li J., Brown E.T., Crowe S.A., and Katsev S (resubmitted). Sediment geochemistry and contributions to carbon and nutrient cycling in a deep meromictic tropical lake: Lake Malawi (East Africa). Limnol. Oceanogr.
  • Katsev, S., Verburg, P., Lliros, M., Minor, E., Kruger, B., Li, J. (2017). Tropical meromictic lakes: specifics of meromixis and case studies of Lakes Tanganyika, Malawi, and Matano. In Ecology of Meromictic Lakes, edited by R. Gulati, E. Zadereev, and A. Degermendzhy. Ecol. Studies Ser., Vol. 228. Springer.

Funding:
UMN OIP Strategic Grant, Linking the past, present, and future: Ecosystem change in Lake Malawi.
United Nations Food and Agriculture Organization.

Media:


Lake Malawi, one of the largest and deepest (700 m) lakes in the World, is feeling the change. The lake is know as a hotspot of biodiversity, with over 800 species of fish, and also for its productive fisheries that are the main source of protein to local populations. The lake's ecology, however, is being affected by both climate change and intensifying land use in its watershed. Though its deep waters are not saline and renewed on a time scale of several decades, Lake Malawi is considered meromictic, and oxygen is absent in its water column below 200 m.

We are investigating the changing physical stratification in this Great Lake, the associated biogeochemical cycling of carbon and nutrients, and the potential for more frequent fish kills, as the lake's productivity may be increasing under the increasing loading of nutrients from watershed.

T Malawi
Lake Malawi sediment
The warming trend in the deep waters of Lake Malawi.
Sediment records from different parts of the lake reflect changing land use and shifting geochemical balances in the lake.

mooring deployment

Deployment of oceanographic mooring.

porewater extraction

Extraction of sediment pore waters.